"Male priapiumfish don't have a penis like humans and other mammals. Instead they have a unique organ called a priapium, which faces backwards and looks like a muscular nozzle. It's actually a modification of the fish's pectoral and pelvic fins.
The priapium of P. cuulong has two attachments, both of which look frankly dangerous. At the bottom near the tip, there is a forward-facing serrated saw, or ctenactinium. Further forward, right under the head, there is a forward-facing rod called the toxactinium."